Jeff Siewert

From an analytical standpoint, the...

Analyzing what's going on in a cartridge case is pretty complicated because there are three different stresses or strains present in the cartridge case along the body.

So there's a strain or actually stress and stretch in the axial direction along the longitudinal axis of the cartridge case.

There is a radial strain.

pushing in from the outs, out from the inside, pardon me, due to the internal pressure.

And then that causes a hoop strain to develop.

So you've got stresses in three different directions at every section along the length of the cartridge.

So from an analytical standpoint, you have to

Any analysis you do on them has to take into account those three, stress and strain condition, okay?

Now, in terms of stretching, where does the case stretch most?

Well, usually it's just aft of where the case body last contacts the chamber.

And if you do it enough, you fire enough times,

you're going to stretch it and thin it as shown with the

the big red arrow on the right-hand side and you can get separations there if you're not paying attention.

And a lot of guys use a paperclip test to find this, find this stretching.

I have, I have used that test and I have been successful in finding stretching.

You need to be diligent about it, particularly with, particularly with rifles and,

And I would say also particularly with cartridges with a belt.

Questions at all?

Doesn't seem to be any yet.